Mechanics of NS!

Watch your oil closely. My suby/ all subys love to burn though the stuff and I have noticed when I am lower on oil my mpg does drop. Granted its not significant but is noticeable.

Yeah I recently replaced my oil filter cause it was leaking on account of the fact that the fuck-tard who had it last tightened the oil filter to the point of puncturing it, and that helped my oil situation, but yeah ill keep an eye out, thanks

Limit the amount of extra weight in your car, clean out your engine/invest in good oil and lube, pump up your tires to the right levels and keep your heat/AC to a minimum. That's how you get good mileage.

check:

change the both o2 sensors i believe there are two on ur model with ones from the dealer. do not buy autozone sensors there is a diffrence on the subarus ive been told. This should correct the problem.

never replace parts without knowing why youre replacing these parts like this fellow is suggesting to you. If you replaced your o2 sensors, you most likely would just piss away money. If there is issues with your o2 sensors, you will get a check engine light.

Keep in mind estimated gas mileage for cars is done at sea level in perfect conditions, so your car will never achieve these goals. A car also runs rich (excessive gas) until it hits its operating temp which is normally 90 degrees, so in winter you will use more gas no matter what you do. If you have a check engine light on in your dash, that is normally an indication of emissions related problems which effect fuel mileage. Fuel filters do not need replacement since gas tanks have started getting a plastic construction instead of metal, so most likely you have no issue with fuel filter.

check airfilter, use proper octane rated gas, inflate tires to spec, remove roof racks, make sure no running issues with the car.

check subaru forums common problem.. ive only owned 3 subarus with this motor and every one of them at some point had fuel economy problems with no signs of any other issue and replacing them improved fuel economy substantially. i dont care if he changes them or not. what do i know.....

Yeah my check engine light recently came on so I flew down to AutoZone and had them run an error codes test. Turns out it was an excessive air flow problem but we found a vacuum leak and the "repair" was as easy as re-connecting a rubber hose to a small nipple. After that the mpgs went up but now theyre back down..........